Improvement in steam-boilers



UNITED STATES PATENT OEEICE.

ABNER CLARK, OF FORT DES MOINES, IOIVA.

IMPROVEMENT IN STEAM-BO-ILERS.

Specication forming part of Letters Patent N o` 19,621, dated March 16,1858.

To @ZZ whom it may concern.'

Be itknown that I, ABNER CLARK, of Fort Des Moines, in the county ofPolk and State of Iowa, have invented a new and Improved Steam-Boiler;and I do hereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming part of this specification, in which- Figures l and 2are vertical sections taken at right angles to each other in the linesa: x and y y, respectively. 3 is a horizontal section of the same in theline z e of Fig. 2.

Similar letters of reference indicate `correspending parts in theseveral figures.

This invention consists of a certain arrangement of tubular water andsteam spaces, water- Walls, and connections in a steam-boiler to obtaina very extensive heating-surface and economize fuel, and at the sametime insure a free circulation of water.

To enable others skilled in the art to make and use my invention, I willproceed to dcscribe its construction and operation.

A B are two upright hollow walls formed of metal plates and arrangedparallel with each other to constitute the back and front or sides ofthe boiler.

C C are horizontal tubes connectingr the two walls A B, and arranged asclose to each other as is consistent with a proper circulation of theflame and products of combustion from the fire-place, which is to besituated bclow them. These tubes are continued nearly to the top of theWater-walls.

D D are a row of tubes much larger than C O, connecting the upper partsof the walls A B and having a slight downward inclination from the wallA to the wall B, as shown in Fig. l.

E is a large tube connected at one end by an elbow, F, with the top ofthe wall A, and at the other end by a double elbow, G, with anothertube, H, of similar size, or larger, and I is a cylinder of largerdiameter than the tubes E H, connected by a double elbow, J, with thetube II.

The tubes E I-I and cylinder I are all made of a length nearly equal tothe length of the tubes C C, added to the thickness of the two walls AB, to permit the whole to be inclosed Within a casing of sheet-iron orbrick-work,

which coniines the products of combustion around the several tubes, thewater-walls, and the cylinder I. The tubes O O are intended to be alwaysiilled with water and the walls A B to be iilled or nearly tilled to thetop, and the larger tubes D D to be iilled or partly filled with water.I prefer the level to be near the top of these latter tubes.

The cylinder I is the steam-chamber from which the steam is taken foruse by the pipe ct. The tubes lll and II serve to convey the steamgenerated in and rising from the lower tubes and water-walls to thechamber I, and

in these tubes E H the particles of unvaporized water taken up insuspension by the steam are allowed to separate from the steam, andthese tubes have both ran inclination in the proper direction for suchWater to run back to the water-wall A. The flame and products ofcombustion from the lire pass between and around all the tubes in acircuitous course, and as they part with their heat to the water in thetubes become cooler as they rise. Thevsteam in the cylinder I is driedby the surrounding products of combustion, which by the time they havearrived at the said cylinder I have become so much cooled as to obviateall danger of burning the said cylinder. Above the steam-chest I thereis an arrangement of pipes for heating the feed-water, all intended to be inolosed within the furnacecasing. This arrangement of pipes I willproceed to describe.

The feed-pipe f enters the upper part of a small box, a, over the wallA, from the lower part of which box horizontal tubes b b run to theupper part of a box, c, over the wall'B, from which latter box anincreased number of tubes, d d d, run into the top of a larger box, e,over the wall A, and from the lower part of the box e a furtherincreased number of tubes, g g, run into the upper part of a larger box,h, over .the Wall B. From the lower part of box h a number of tubes, t't', run to the upper part of al box, j, and from the lower part of thisbox a pipe, k, runs back under the box h, and rises outside of the box hto the lower one of two'compartments in a small box, Z, outside of thebox o, and from this compartment of the box l a pipe, fm, descende tothewall B, where the water is received into the main body of theboiler.There is a pipe, n, leading from the upper part of the box 7b to anupper compartment of the box l, which compartment also has acommunication With the upper compartment of the boX c, which is thusmade to oolleet any steam that may be generated in the tubes d g t', anda pipe, 0, serves to convey such steam from the said box down to the topof `the Wall B. By the above arrangement of tubes and boxes thefeed-Water is heated to a high temperature by heat Which would otherwisebe Wasted.

I do not claim, broadly, the employment of a series of pipes for heatingthe Water and Collecting the Steam, nor do I Claim, broadly, the heatingof the feed-Water by the escaping products of combustion; but thespecial ar- ABNER CLARK.

. Witnesses:

WM. SULLIVAN, SAML. CHAPMAN.

